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(syms_of_process): Intern and staticpro it.
(Fprocess_variable, Fset_process_variable): New functions.
(syms_of_process): Defsubr them.
(Fstart_process): Initialize private_vars plist to nil.
(Fmake_network_process): New arg :vars to setup the private
variables for new network process.
(server_accept_connection): Copy server's private variables to
client process.